Staffan de Mistura's remarks came a day after the United States announced the regime of Bashar al-Assad was preparing a fresh chemical attack, warning that Damascus would pay a "heavy price" for such an assault.
"The ideal trajectory over the coming two weeks could be... Progress in Astana on 4-5 July, then a further set of joint technical aspects meetings with the opposition group in the same week, and then a continued discussion and dialogue hopefully among main international stakeholders including at the G20 summit in Hamburg on 7-8 July," said De Mistura.
Fresh talks for peace in Syria sponsored by Russia, Iran and Turkey are set to be held in Astana, the capital of Kazakhstan, on July 4 and July 5 before a seventh round of UN-sponsored negotiations on July 10 in Geneva.
During the last talks in Astana in May, Russia and Iran -- allies of Assad -- and Turkey, a supporter of the rebels, adopted a plan that envisaged the creation of secured zones in order to establish a lasting truce in several regions.
The last round of negotiations in Geneva concluded on May 19, without real progress.
Tensions between the various sides in the Syrian conflict, which has claimed more than 3,20,000 lives in six years, have grown this month -- particularly between the Syrian regime and US-backed forces.
Russia denounced US "threats" against its ally today, terming them unacceptable.
Moscow has consistently rejected accusations that Damascus was behind a deadly chemical weapons attack in Syria in April.
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